<p begin="00:00:07.633" end="00:00:09.278" style="s2">- [Voiceover] A linear array transducer</p>
<p begin="00:00:09.278" end="00:00:11.397" style="s2">with a musculoskeletal exam type</p>
<p begin="00:00:11.397" end="00:00:13.874" style="s2">is used to perform an<br />ultrasound examination</p>
<p begin="00:00:13.874" end="00:00:16.046" style="s2">of Guyon's canal.</p>
<p begin="00:00:16.046" end="00:00:18.047" style="s2">The patient is placed<br />in a sitting position</p>
<p begin="00:00:18.047" end="00:00:21.467" style="s2">with the dorsal hand placed<br />on an examination table.</p>
<p begin="00:00:21.467" end="00:00:23.801" style="s2">The transducer is placed<br />over the wrist crease</p>
<p begin="00:00:23.801" end="00:00:26.357" style="s2">in a transverse fashion,<br />with the orientation marker</p>
<p begin="00:00:26.357" end="00:00:28.779" style="s2">directed towards the patient's right.</p>
<p begin="00:00:28.779" end="00:00:31.123" style="s2">The pisiform bone is seen as a bright,</p>
<p begin="00:00:31.123" end="00:00:33.492" style="s2">hyperechoic, prominent structure.</p>
<p begin="00:00:33.492" end="00:00:36.599" style="s2">The ulnar artery is a<br />round, pulsatile structure</p>
<p begin="00:00:36.599" end="00:00:38.669" style="s2">above the flexor retinaculum,</p>
<p begin="00:00:38.669" end="00:00:41.274" style="s2">which appears as a hyperechoic line.</p>
<p begin="00:00:41.274" end="00:00:43.185" style="s2">The ulnar nerve is located between</p>
<p begin="00:00:43.185" end="00:00:45.424" style="s2">the ulnar artery and the pisiform,</p>
<p begin="00:00:45.424" end="00:00:48.849" style="s2">and can be seen as a darker,<br />fasciculated structure.</p>
<p begin="00:00:48.849" end="00:00:50.715" style="s2">The transducer should be slowly moved</p>
<p begin="00:00:50.715" end="00:00:53.447" style="s2">distal to the wrist crease<br />to follow the ulnar nerve</p>
<p begin="00:00:53.447" end="00:00:56.339" style="s2">until it splits into a<br />superficial sensory branch</p>
<p begin="00:00:56.339" end="00:00:58.674" style="s2">and a deeper motor branch which courses</p>
<p begin="00:00:58.674" end="00:01:00.885" style="s2">alongside the hamate hook.</p>
<p begin="00:01:00.885" end="00:01:03.924" style="s2">The arcade of the flexor<br />brevis can be seen in this view</p>
<p begin="00:01:03.924" end="00:01:06.163" style="s2">as an oval, hyperechoic structure</p>
<p begin="00:01:06.163" end="00:01:09.913" style="s2">just between the branches<br />of the ulnar nerve.</p>